Countersinking tool



Sept. l2, 1950 T. E. wRgGHT 2,522,330 COUNTERSINKING Toor.

Filed April 16, 1947 W, @ghz INVENTGH BY .I l Il l ATTGRNEYS- Patented Sept. 12, 1950 PATENT orales 2,522,330 l l y COUNTERSINKING TooL rho-nes Eugene wright, Bellevue, "N, il.

Agone-ation April 1e, 1947, serial Na 141,915

' l'elaim. (cinemas) This invention relates to counters'inkln'g tools, and more especially, to a device for holding the tool adjustably, so as to limit the .depth of the cut produced thereby without scarring or otherwise defacing the surface adjacent 'to the opening or recess Vproduced lby the tool.

A .further object is to provide a device of this character the use of which insures accurate duplication of countersinks 'so that after the parts once are set, any desired number of countersinks can be produced, all of which will be of 'the same size and proportions.

.Another object isto provide adevice of the class stated which constitutes ,an 'antifiiction collar or guide .for the countersinking tool of conventional style, the entire structure being simple and inexpensive in construction and, in addition thereto, insuring extreme .accuracy both to the depth and shape of the'hole's produced.

.Another object is to provide afstructure which is designed to permit the treev escape of chips during the reaming or countersinliin'g' opera-` tion.

A further important object of the invention is to provide a countersinking tool in which the countersink held thereby canbe adjusted longitudinally, and ei'ciently and accurately retained in its position of adjustment, by novel means not requiring removal of the tool from the chuck in which 'it is locked. 1

With the foregoingand other objects in "view which will appear a's the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described .and pointed vout in the claims, it being understood that changes .may made in the construction andL arrangement Aof parts without departing from the spirit "of the inventionv as claimed. 1

. Reierring to the drawings: .Y

Figure 1 is a view partly in side elevation and partly in vertical section, .through the device constituting the present invention, a counter- 'sinkingfor .roaming tool being shown in position therein, and in engagement withthe worin.v

Figure 2 is a view taken on line 2--2` of Figure `1.

Figure 3 is a view partly in elevation and partly in section., showing a modified. structure. l

Figure 4 is a bottom view of the structure illustrated in Figure 3.

Referring to the drawing in detail, 5 designates a tubular body portion formed with a cylindrical bore B, the bore extending completely through the body portion. The body portion 5 fitted within a stationary or bearing member,

' 2 constitutes the main 'member oi a 'rotatable structure,

` The .bore s is proportioned torecelve a reaming or counter'snking tool T ofthe maximum size to be used, the tool vT having .the 'shank S, that is of reduceddiameter relative 'to the remaining portion of the tool. y

An adjusting screw 1 or the like is 'adapted to be inserted through any of a plurality o'f openings 8 that are v`formed in the wall oi 'the lbody portion 5, these openings being preferably arranged spirally, and being formed at different .Joints longitudinally of the body Iportion. 'The screw 1 is adapted to engage., at its pointed end,

the shoulder formed at the intersection ofthe shank Sr and the thickened or 'lower portion of the tool T.

Thus, by reason of the provision of the plurallty .of openings a, -.the tool "T 'can be positi'oneii adjustably relative -.to the body `portion 5. Addi- `tionally, it 'may be noted that the provision of these openings .8 arranged as shown permits the use in 4the device of countersinking tools haw ing the shoulder 'mentioned above located at dlrferent points between .the ends of the counterusinking tool. The screw 1 is entered through a selected openings which will be nearest the shoulder of the -toolfT selected, whereupon by threadin'gthe screw inwardly or outwardly as desired, fine adjustment as to the depth of the recess to be countersunk can be made.

In operation, the body vportion 5 rotates, the tool T lwill rotate with it. For lthis `iourizao'se, I employ a set screw l' fthreadable through an opening inthe wall of the body liior'tion 5 Vagainst the tool T. 'one portion of the wallet the tool T is formed with a `longl'tullnally disposed dat portion 8' against which lthe screw '1' is threaded. At its upper end, the bore i6 vis threaded as .at .9, to vreceive the screw l0, that is adapted Yto engage the upper end of thefshank S, `after the countersinlrirrg; tool T has been adiustably posi- `finned in the bodyportion 5 rby vmeans of the 'screw '1.

The lower end of the body 'portion 5 is 'tightly that includes a ball bearing l'l which can be off any type necessary' to meet the requirements. One form of ball bearing has been illustrated, but it is to be understood that a bearing made up of concentric rings instead of superposed rings could be utilized, both forms of bearings being well known in the art.

Infeither case, the ball bearing' Il is mounted within a. recess I2, formed in the upper face of Afteralltodlhas been selected .for .the purpose of producing a countersink or recess of the desired proportions, the tool is adjusted longitudinally of the body portion 5 in the man nerhereV i inbeiore described, so that when a recess of the desired depth has been producedfthecollar I3.

will contact with the surface of the Work and d prevent the tool from cutting too deeply thereinto. The tool T is securely fastened to the body portion 5 by means oi the screws l and 1', and -Jthe screw I 111s of Y course adjusted- .against the end 'of' the shank S, so as to constitutea positive abutment for the shank. 01jl course, lif further small adjustment is desired afterv the body .portion d hasbeen placed inthe drill chuck, can be eiectedwithout removing the body portion from the chuck, as described '.abgve. d With theuparts thus adjusted and held' relative `to each other, the device can be@ used in the .ordi na'ry` fway 4 forl producing any desired numbervof countersinks, andv it will be'foundthat f in every case the. zcountersinks will be exactly duplicated. As the collar I3 does not rotate with the tool, but merely presses againstthe surfaceof the vs /vork,` there is no danger. o f scarring the work during the cuttingpperation, Itis possible, lwith this arrangement, toproduce a great number 'of like countersinks in a short period of time, thus speeding up. greatly the completion of Work in which numerous countersinksare required.

. Obviously, toolspf different sizes less than the d ieuneter4 of the bore d caribe used in the device, it being A merely essential that all' of thev tools have shoulders engageableby the screw I, this beingcustomary i f lt isjto be understood ofcourse that the means for rotating'theztool isto be proportioned to 'bodily engage andgrip the body portion 5. Under someqcvonditions, it is desirable to pro; vide a means whereby the chips produced by the Yreaming operation can pass freely away from the cutting tool. Under these conditions, the collar It,l `instead of being brought directly against the surface of the work, is equipped with a supplemental colla-r IB, which as clearlyshown in Figure surrounds the collar I3 and can be securely held thereto in any desired yrnanner, as by means ofone or more set screws I1.

'I he Isupplemental collar I6 canhbe provided with a frusto-conical. extension IB, or can'be xof any other suitable shape, and the lower end I9 thereof, whichcontacts with the surface of the work, can beformed with radial slots or grooves 2l), constituting outlets. Supplemental outlets, in the f orn1 of .openings 2I, can be .ex-

theres#- s cludin'g 'a stationary ,Inemben '.arotatable body portion having one ci. Q

As the cutting tool T extends through the supplemental collar I6, and has its cutting end C projecting therebeyond a distance suicient to produce a countersink of the desired depth, it will be obvious that any chips produced by the cutting operation will be free to move outwardly away from the tool, through either or both the grooves 2U and openings 2l.

hasibee'n indicated at W`.` ir1 What is claimed is:

f'Ihe Combination, with a countersink having a cutting head and a shank extending there- *,Inffthedrawing, the workengagedby the tool.

'from reduced in diameter relative to the head to define ashoulder spaced from the cutting end cfsaid head, of a countersink holder inwork-engaging bearing end mounted to rotate;,in the bearing member andtheother en d proportioned for gripping by a c huclg, ,there beingl an end-to-end bore of`constapt 'di'ameteruinfthe body portion and'said borebe'ing threaded at the second-named end of the bo dy `po1tion, the head being extended into and being aA snug fit lWithin the bore,` a Set' screw threadable throu'gl'il the side wall of the body'porltion againsty thecutting head to hold the counter'si'nl; and body portion against relative rotar tion, fthe" s l'iank- .being of' constant diameter to define4 `.a space between theA shank wall 'and Wall of the bore extending from the shoulder to ,the free end ci theshank, the body' portion having. a longitudinal series of spirallyarranged openingscommunicating with said space, an ad!- justing screw threadable through anyy of said openings jto exten'd into said` space and having atapered end vfor cam engagement with the countersink 'shoulder to adjust the counter' sink longitudinally of thebodyv portion, arid a holdingscrew threadable in said threaded end of thebore and against the inner. end of the countersink to hold the countersink in its lon# gitudinally adjusted position and against retrograde movement aiter longitudinal adjustment of the countersink relative to the .bodyv portion.

. i f TnoMAsv EUGENE WRIGHT.

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